package com.wang.controller;

import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.wang.common.R;
import com.wang.dto.DishDto;
import com.wang.entity.Category;
import com.wang.entity.Dish;
import com.wang.entity.DishFlavor;
import com.wang.service.CategoryService;
import com.wang.service.DishFlavorService;
import com.wang.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@RestController
@RequestMapping("/dish")
@Slf4j
public class DishController {

    @Autowired
    private DishService dishService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private CategoryService categoryService;

    @Resource
    private RedisTemplate redisTemplate;

    /**
     * 新增菜品
     * @param dishDto
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto){
        log.info(dishDto.toString());

        dishService.saveWithFlavor(dishDto);

        //清理所有菜品的缓存数据
        Set keys = redisTemplate.keys("dish_*");
        redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存数据
        //String key = "dish_" + dishDto.getCategoryId() + "_1";
        //redisTemplate.delete(key);

        return R.success("新增菜品成功！");
    }

    /**
     * 分页查询菜品
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page,int pageSize,String name){

        //构建分页构造器对象
        Page<Dish> pageInfo = new Page<>(page,pageSize);
        Page<DishDto> dishDtoPage = new Page<>();

        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();

        //添加过滤条件
        queryWrapper.like(name != null,Dish::getName,name);

        //添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);

        //分页查询
        dishService.page(pageInfo,queryWrapper);

        //数据拷贝
        BeanUtils.copyProperties(pageInfo,dishDtoPage,"records");

        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map((item) -> {
            DishDto dishDto = new DishDto();

            BeanUtils.copyProperties(item,dishDto);

            Long categoryId = item.getCategoryId();//分类id

            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);


            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }
            return dishDto;
        }).collect(Collectors.toList());

        dishDtoPage.setRecords(list);


        return R.success(dishDtoPage);
    }

    /**
     * 根据id查询菜品信息和对应的口味信息
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id){

        DishDto dishDto = dishService.getByIdWithFlavor(id);

        return R.success(dishDto);
    }

    /**
     * 修改菜品
     * @param dishDto
     * @return
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto){

        log.info(dishDto.toString());

        dishService.updateWithFlavor(dishDto);

        //清理所有菜品的缓存数据
        Set keys = redisTemplate.keys("dish_*");
        redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存数据
        //String key = "dish_" + dishDto.getCategoryId() + "_1";
        //redisTemplate.delete(key);

        return R.success("新增菜品成功！");

    }

    /**
     * 根据条件查询对应的菜品数据
     * @return
     */
    /*@GetMapping("/list")
    public R<List<Dish>> list(Dish dish){

        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();

        //添加条件，查询状态为1（起售状态）的菜品
        queryWrapper.eq(dish.getCategoryId() != null,Dish::getCategoryId,dish.getCategoryId());
        queryWrapper.eq(Dish::getStatus,1);//再添加一个条件

        //添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        return R.success(list);
    }*/


    /**
     * 根据条件查询对应的菜品数据(缓存优化)
     * @return
     */
    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish){

        List<DishDto> dishDtoList = null;

        //动态构造key
        String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();

        //先从Redis获取缓存数据//注意加上Redis序列化配置类
        dishDtoList = (List<DishDto>)redisTemplate.opsForValue().get(key);

        if(dishDtoList != null){
            //如果存在，直接退回，无需查询数据库
            return R.success(dishDtoList);
        }

            //构造查询条件
            LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
            queryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId, dish.getCategoryId());
            //添加条件，查询状态为1（起售状态）的菜品
            queryWrapper.eq(Dish::getStatus, 1);

            //添加排序条件
            queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

            List<Dish> list = dishService.list(queryWrapper);

            dishDtoList = list.stream().map((item) -> {
                DishDto dishDto = new DishDto();

                BeanUtils.copyProperties(item, dishDto);

                Long categoryId = item.getCategoryId();//分类id
                //根据id查询分类对象
                Category category = categoryService.getById(categoryId);

                if (category != null) {
                    String categoryName = category.getName();
                    dishDto.setCategoryName(categoryName);
                }

                //当前菜品的id
                Long dishId = item.getId();
                LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
                lambdaQueryWrapper.eq(DishFlavor::getDishId, dishId);
                //SQL:select * from dish_flavor where dish_id = ?
                List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
                dishDto.setFlavors(dishFlavorList);
                return dishDto;
            }).collect(Collectors.toList());

        //如果不存在，需要查询数据库，将查询到的菜品数据缓存到Redis
        redisTemplate.opsForValue().set(key, String.valueOf(dishDtoList),60, TimeUnit.MINUTES);//注意value值转为String

        return R.success(dishDtoList);
    }
}
